xfinity connect app and Wi-Fi hotspot

When I originally had my own Wi-Fi equipment my personal devices work wonderful. Then we were sent the the new Wi-Fi system with Internet voice and Wi-Fi. now my cell phone is constantly searching and I have to always turn my Wi-Fi settings off my phone because none of my pages will load and keep saying lost internet connection. Furthermore the Xfinity app internet Connect app where I can see my emails voice calls and I no longer have texting through it by the way which I used to. Interferes with my cell phone speed, no mater where I am, and connectivity as well. Since I have unloaded Xfinity Connect app my phone works. Your Wi-Fi them in my house slows everything down why doesn't it work like my ow one did.